PRODUCTION OF CURABLE CASTING MOLD

摘要

PURPOSE:To improve the packing density and surface stability of a sand mold and to permit easy reactive curing in the stage of forming the sand mold by a blowing method by using heated air for pressurized air for blowing. CONSTITUTION:Heated air is used for pressurized air for blowing and the temp. thereof is kept at 40-150 deg.C and the pressure at 1.5-6.0kg/cm<2> in the case of blowing a granular refractory mixture added with an org. binder together with the pressurized air to a pattern for forming a casting mold, introducing a curing catalyst or hardener in the form of gas or aerosol into the pattern and forming the casting mold. A polyhydric alcoholic compd. and polyhydric isocyanate compd. or acid curable resin and peroxide are used as the org. binder and a tertiary amine or sulfur dioxide is used for the curing catalyst or hardener. The efficient production of the casting mold is made possible without using the unnecessary binder and the casting mold having high quality is obtd.